{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2024-46780","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2024-09-11T15:12:18.276Z","datePublished":"2024-09-18T07:12:36.736Z","dateUpdated":"2026-08-05T11:38:31.009Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-05T11:38:31.009Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnilfs2: protect references to superblock parameters exposed in sysfs\n\nThe superblock buffers of nilfs2 can not only be overwritten at runtime\nfor modifications/repairs, but they are also regularly swapped, replaced\nduring resizing, and even abandoned when degrading to one side due to\nbacking device issues.  So, accessing them requires mutual exclusion using\nthe reader/writer semaphore \"nilfs->ns_sem\".\n\nSome sysfs attribute show methods read this superblock buffer without the\nnecessary mutual exclusion, which can cause problems with pointer\ndereferencing and memory access, so fix it."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - The vulnerable code is reached by reading a sysfs attribute file under /sys/fs/nilfs2/<device>/, which requires local access to the system. There is no network-facing path into nilfs2's sysfs show methods.\nAC:L - The attacker fully controls the read side and can retry unboundedly by spamming reads of the world-readable attributes from many threads, while the mutating side (nilfs_swap_super_block via nilfs_prepare_super during segment construction) fires repeatedly on any active nilfs2 mount and can be forced with write+sync activity. Unbounded, cheap retry against a continuously recurring window makes this reliably winnable.\nPR:L - The affected attributes are created with NILFS_DEV_RO_ATTR, i.e. mode 0444, so any unprivileged local user can read them with no capability whatsoever. No CAP_SYS_ADMIN is needed on the reader side — only on the unrelated mount/resize side.\nUI:N - Once a nilfs2 volume is mounted (at boot, via fstab, or by an automounter such as udisks on a kiosk/desktop), the attacker triggers the bug entirely on their own by reading sysfs. No victim action is required at exploitation time.\nS:U - The race, the freed page-cache folio, and the resulting disclosure or crash are all within the kernel's own security authority. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - When ns_sbp[0] has been released or replaced (nilfs_fall_back_super_block after an -EIO superblock write, or nilfs_move_2nd_super during resize), the show methods perform a use-after-free read of a freed bdev page-cache folio and copy those bytes verbatim to userspace via sysfs_emit/scnprintf — up to 80 bytes per read from volume_name, repeatable in a loop, yielding a kernel memory disclosure primitive over reallocated page contents.\nI:H - This is a use-after-free on a page-cache folio whose reuse the attacker can groom via page-spray, and per kernel UAF scoring practice such object-lifetime bugs are treated as leverageable for control over freed-and-reallocated kernel memory rather than as read-only. The unsynchronized pointer also lets the reader observe torn state (nilfs_dev_revision_show reloads sbp[0] twice across a swap), so kernel object state is consumed inconsistently.\nA:H - Dereferencing a superblock pointer that has been abandoned during degradation to one side, or that points into a released buffer_head's page, causes a kernel oops/panic — the commit explicitly cites \"problems with pointer dereferencing and memory access.\" Any such crash is High availability impact."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/nilfs2/sysfs.c"],"versions":[{"version":"da7141fb78db915680616e15677539fc8140cf53","lessThan":"b90beafac05931cbfcb6b1bd4f67c1923f47040e","status":"affected","versionType":"git"},{"version":"da7141fb78db915680616e15677539fc8140cf53","lessThan":"ba97ba173f9625d5f34a986088979eae8b80d38e","status":"affected","versionType":"git"},{"version":"da7141fb78db915680616e15677539fc8140cf53","lessThan":"157c0d94b4c40887329418c70ef4edd1a8d6b4ed","status":"affected","versionType":"git"},{"version":"da7141fb78db915680616e15677539fc8140cf53","lessThan":"b14e7260bb691d7f563f61da07d61e3c8b59a614","status":"affected","versionType":"git"},{"version":"da7141fb78db915680616e15677539fc8140cf53","lessThan":"19cfeba0e4b8eda51484fcf8cf7d150418e1d880","status":"affected","versionType":"git"},{"version":"da7141fb78db915680616e15677539fc8140cf53","lessThan":"8c6e43b3d5f109cf9c61bc188fcc8175404e924f","status":"affected","versionType":"git"},{"version":"da7141fb78db915680616e15677539fc8140cf53","lessThan":"962562d4c70c5cdeb4e955d63ff2017c4eca1aad","status":"affected","versionType":"git"},{"version":"da7141fb78db915680616e15677539fc8140cf53","lessThan":"683408258917541bdb294cd717c210a04381931e","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/nilfs2/sysfs.c"],"versions":[{"version":"3.17","status":"affected"},{"version":"0","lessThan":"3.17","status":"unaffected","versionType":"semver"},{"version":"4.19.322","lessThanOrEqual":"4.19.*","status":"unaffected","versionType":"semver"},{"version":"5.4.284","lessThanOrEqual":"5.4.*","status":"unaffected","versionType":"semver"},{"version":"5.10.226","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.167","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.110","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.51","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.10.10","lessThanOrEqual":"6.10.*","status":"unaffected","versionType":"semver"},{"version":"6.11","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.17","versionEndExcluding":"4.19.322"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.17","versionEndExcluding":"5.4.284"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.17","versionEndExcluding":"5.10.226"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.17","versionEndExcluding":"5.15.167"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.17","versionEndExcluding":"6.1.110"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.17","versionEndExcluding":"6.6.51"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.17","versionEndExcluding":"6.10.10"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.17","versionEndExcluding":"6.11"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/b90beafac05931cbfcb6b1bd4f67c1923f47040e"},{"url":"https://git.kernel.org/stable/c/ba97ba173f9625d5f34a986088979eae8b80d38e"},{"url":"https://git.kernel.org/stable/c/157c0d94b4c40887329418c70ef4edd1a8d6b4ed"},{"url":"https://git.kernel.org/stable/c/b14e7260bb691d7f563f61da07d61e3c8b59a614"},{"url":"https://git.kernel.org/stable/c/19cfeba0e4b8eda51484fcf8cf7d150418e1d880"},{"url":"https://git.kernel.org/stable/c/8c6e43b3d5f109cf9c61bc188fcc8175404e924f"},{"url":"https://git.kernel.org/stable/c/962562d4c70c5cdeb4e955d63ff2017c4eca1aad"},{"url":"https://git.kernel.org/stable/c/683408258917541bdb294cd717c210a04381931e"}],"title":"nilfs2: protect references to superblock parameters exposed in sysfs","x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2024-09-29T14:38:16.059134Z","id":"CVE-2024-46780","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2024-09-29T14:38:30.940Z"}},{"title":"CVE Program Container","references":[{"url":"https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"},{"url":"https://lists.debian.org/debian-lts-announce/2024/10/msg00003.html"}],"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2025-11-03T22:18:20.810Z"}}]}}